Ruling · Dattātreyotpatti (Datta Jayanti) · 1933

Friday 1 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 445 minutes.

Decide it for

BaodingDelhiKolkataSingaporeSydneyJersey City

38°52′ N 115°28′ E · Asia/Shanghai · GeoNames 1816971

The two evenings

One ghaṭī is 24 minutes. Pradoṣa is 2 muhūrtas after sunset.

Evening of Friday 1 December

Taken. The only evening Pūrṇimā reaches.

16:57 sunsetpradoṣa ends 18:51
16:3316:5717:2117:4518:0918:3318:5719:21

115 of 115 minutes covered

Evening of Saturday 2 December

Pūrṇimā is absent from pradoṣa. Not taken.

16:56 sunsetpradoṣa ends 18:51
16:3216:5617:2017:4418:0818:3218:5619:20

0 of 115 minutes covered

Pūrṇimā presentPradoṣa, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 07:29 on Fri 1 Dec to 09:31 on Sat 2 Dec.

    1933-11-30T23:29:06Z → 1933-12-02T01:30:53Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:57–18:51 on the 1st, 16:56–18:51 on the 2nd.

    pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Pūrṇimā must be present during pradoṣa. It covers 115 of 115 minutes on the 1st and 0 of 115 on the 2nd.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104

  4. 04

    Tie-break

    Only one evening qualifies. No tie-break is needed.

    priority: unstated → only-day · margin 26727 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 1933: Friday 1 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1933 falls on Friday 1 December. Pūrṇimā runs from 07:29 on Fri 1 Dec to 09:31 on Sat 2 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1933/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 1 Dec
Ahargaṇa, classicalDisc centre, no refractionFri 1 Dec
compat-drikpanchangComparison profileFri 1 Dec
No institution has a recorded ruling for Baoding.

Institutional rulings are recorded with a source address, and are never edited to agree.

The rule, as data

/rules/dattatreyotpatti · ruleset 2026.3-draft

Month
Mārgaśīrṣa, amānta
Pakṣa · aṅga
Śukla · Pūrṇimā
Kāla
Pradoṣa
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 104

“S 15 Dattatreyotpatti (pradosa).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlacePūrṇimāSunset 30thCoveredSunset 2ndCoveredRuled
Los Angeles15:29 → 17:3116:44112 min16:430 min30 Nov
Chicago17:29 → 19:3116:2149 min16:200 min1 Dec
Jersey City18:29 → 20:3116:300 min16:290 min1 Dec
Port of Spain19:29 → 21:3117:410 min17:420 min1 Dec
London23:29 → 01:3115:560 min15:540 min1 Dec
Durban01:29 → 03:3118:410 min18:430 min1 Dec
Dubai03:29 → 05:3117:280 min17:280 min1 Dec
Delhi04:59 → 07:0117:240 min17:240 min1 Dec
Kolkata04:59 → 07:0116:510 min16:510 min1 Dec
Singapore06:49 → 08:5118:150 min18:150 min1 Dec
Sydney09:29 → 11:3118:500 min18:510 min1 Dec
Suva11:29 → 13:3118:280 min18:290 min1 Dec
Profile · tradition
pac-rp@2026.1 · smarta
Rule
dattatreyotpatti@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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